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<p>Internally used class that enables some of the activities of <a class="el" href="namespaceflow_1_1util.html#a0955a29930075ac1fe393896c089b911" title="Sets certain chrono-related formatting on the given ostream that results in a consistent,...">beautify_chrono_ostream()</a> API.  
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Public Member Functions</h2></td></tr>
<tr class="memitem:a278ff65fd0d9da3051d952557e4f9e46"><td class="memItemLeft" align="right" valign="top">boost::chrono::duration_units&lt; char_type &gt;::string_type&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#a278ff65fd0d9da3051d952557e4f9e46">do_get_ratio_prefix</a> (boost::chrono::duration_style style, boost::micro period_tag) const override</td></tr>
<tr class="memdesc:a278ff65fd0d9da3051d952557e4f9e46"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the prefix string for micro-units; namely the default thing for long-form format ("micro") but the non-default "u" for the short-form.  <a href="classflow_1_1util_1_1Duration__units__beautified.html#a278ff65fd0d9da3051d952557e4f9e46">More...</a><br /></td></tr>
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Static Public Member Functions</h2></td></tr>
<tr class="memitem:aa689f853f75e06263d6875ae5824a4c6"><td class="memItemLeft" align="right" valign="top">static const std::locale &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#aa689f853f75e06263d6875ae5824a4c6">beautified_locale</a> ()</td></tr>
<tr class="memdesc:aa689f853f75e06263d6875ae5824a4c6"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns a reference to a locale that &ndash; if imbued onto an <code>ostream</code> &ndash; equals <code>std::locale::classic</code> except beautified by a <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html" title="Internally used class that enables some of the activities of beautify_chrono_ostream() API.">Duration_units_beautified</a> facet (as described in the class doc header).  <a href="classflow_1_1util_1_1Duration__units__beautified.html#aa689f853f75e06263d6875ae5824a4c6">More...</a><br /></td></tr>
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Private Types</h2></td></tr>
<tr class="memitem:a680e64f096ccdad42b4f4c404d412391"><td class="memItemLeft" align="right" valign="top">using&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#a680e64f096ccdad42b4f4c404d412391">Duration_units_default</a> = <a class="el" href="classboost_1_1chrono_1_1duration__units__default.html">boost::chrono::duration_units_default</a>&lt; char &gt;</td></tr>
<tr class="memdesc:a680e64f096ccdad42b4f4c404d412391"><td class="mdescLeft">&#160;</td><td class="mdescRight">Short-hand for superclass.  <a href="classflow_1_1util_1_1Duration__units__beautified.html#a680e64f096ccdad42b4f4c404d412391">More...</a><br /></td></tr>
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Private Member Functions</h2></td></tr>
<tr class="memitem:a1fe87e2f94792415055398097e6d494b"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#a1fe87e2f94792415055398097e6d494b">Duration_units_beautified</a> ()</td></tr>
<tr class="memdesc:a1fe87e2f94792415055398097e6d494b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Constructs.  <a href="classflow_1_1util_1_1Duration__units__beautified.html#a1fe87e2f94792415055398097e6d494b">More...</a><br /></td></tr>
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Static Private Attributes</h2></td></tr>
<tr class="memitem:a5c21a947d16a428314a077528876bde3"><td class="memItemLeft" align="right" valign="top">static std::locale const  *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#a5c21a947d16a428314a077528876bde3">s_beautified_locale_or_null</a></td></tr>
<tr class="memdesc:a5c21a947d16a428314a077528876bde3"><td class="mdescLeft">&#160;</td><td class="mdescRight">Pointer returned by <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#aa689f853f75e06263d6875ae5824a4c6" title="Returns a reference to a locale that – if imbued onto an ostream – equals std::locale::classic except...">beautified_locale()</a>, pointing to an object allocated exactly once; or null if that has not yet been called.  <a href="classflow_1_1util_1_1Duration__units__beautified.html#a5c21a947d16a428314a077528876bde3">More...</a><br /></td></tr>
<tr class="separator:a5c21a947d16a428314a077528876bde3"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aabd0fb641c4234515bac298d7a11d7c3"><td class="memItemLeft" align="right" valign="top">static boost::once_flag&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#aabd0fb641c4234515bac298d7a11d7c3">s_beautified_locale_init_flag</a></td></tr>
<tr class="memdesc:aabd0fb641c4234515bac298d7a11d7c3"><td class="mdescLeft">&#160;</td><td class="mdescRight">Helper to initialize <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#a5c21a947d16a428314a077528876bde3" title="Pointer returned by beautified_locale(), pointing to an object allocated exactly once; or null if tha...">s_beautified_locale_or_null</a> at most once.  <a href="classflow_1_1util_1_1Duration__units__beautified.html#aabd0fb641c4234515bac298d7a11d7c3">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p >Internally used class that enables some of the activities of <a class="el" href="namespaceflow_1_1util.html#a0955a29930075ac1fe393896c089b911" title="Sets certain chrono-related formatting on the given ostream that results in a consistent,...">beautify_chrono_ostream()</a> API. </p>
<p >It's a locale facet, whose <code>virtual</code> API can be used to imbue onto an <code>ostream</code>; but even within our own internal code the only public API used is <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#aa689f853f75e06263d6875ae5824a4c6" title="Returns a reference to a locale that – if imbued onto an ostream – equals std::locale::classic except...">beautified_locale()</a>, which returns a reference to a ready-made such <code>std::locale</code>.</p>
<p >This facet enables the default <code>chrono</code> output behavior, except the "micro" short-form prefix is just "u" instead of the default Unicode Greek letter mu.</p>
<h3>Implementation notes</h3>
<p >How it does this is fairly self-explanatory, but finding out how to do it was annoyingly tricky due to the inconsistent/outdated boost.chrono docs which only partially explain boost.chrono I/O v2. Ultimately I had to find the actual example <code>french.cpp</code> (not its outdated v1 version directly inside the main doc text, in Boost 1.76); then cross-reference it with the Reference section that described the <code>duration_units_default</code> class. </p>

<p class="definition">Definition at line <a class="el" href="util_8cpp_source.html#l00041">41</a> of file <a class="el" href="util_8cpp_source.html">util.cpp</a>.</p>
</div><h2 class="groupheader">Member Typedef Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a680e64f096ccdad42b4f4c404d412391">&#9670;&nbsp;</a></span>Duration_units_default</h2>

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          <td class="memname">using <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#a680e64f096ccdad42b4f4c404d412391">flow::util::Duration_units_beautified::Duration_units_default</a> =  <a class="el" href="classboost_1_1chrono_1_1duration__units__default.html">boost::chrono::duration_units_default</a>&lt;char&gt;</td>
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<p>Short-hand for superclass. </p>

<p class="definition">Definition at line <a class="el" href="util_8cpp_source.html#l00082">82</a> of file <a class="el" href="util_8cpp_source.html">util.cpp</a>.</p>

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<h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
<a id="a1fe87e2f94792415055398097e6d494b" name="a1fe87e2f94792415055398097e6d494b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1fe87e2f94792415055398097e6d494b">&#9670;&nbsp;</a></span>Duration_units_beautified()</h2>

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<p>Constructs. </p>

<p class="definition">Definition at line <a class="el" href="util_8cpp_source.html#l00110">110</a> of file <a class="el" href="util_8cpp_source.html">util.cpp</a>.</p>

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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aa689f853f75e06263d6875ae5824a4c6">&#9670;&nbsp;</a></span>beautified_locale()</h2>

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<p>Returns a reference to a locale that &ndash; if imbued onto an <code>ostream</code> &ndash; equals <code>std::locale::classic</code> except beautified by a <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html" title="Internally used class that enables some of the activities of beautify_chrono_ostream() API.">Duration_units_beautified</a> facet (as described in the class doc header). </p>
<h3>Thread safety and perf</h3>
<p >This (<code>static</code>) method is safe to call concurrently with itself. Internally it achieves this possibly by using a simple mutex. Since it is not expected one would call this frequently, let alone frequently enough for any contention to occur, we consider this acceptable.</p>
<dl class="section return"><dt>Returns</dt><dd>See above. </dd></dl>

<p class="definition">Definition at line <a class="el" href="util_8cpp_source.html#l00116">116</a> of file <a class="el" href="util_8cpp_source.html">util.cpp</a>.</p>

<p class="reference">References <a class="el" href="util_8cpp_source.html#l00098">s_beautified_locale_init_flag</a>, and <a class="el" href="util_8cpp_source.html#l00095">s_beautified_locale_or_null</a>.</p>

<p class="reference">Referenced by <a class="el" href="util_8cpp_source.html#l00173">flow::util::beautify_chrono_ostream()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a278ff65fd0d9da3051d952557e4f9e46">&#9670;&nbsp;</a></span>do_get_ratio_prefix()</h2>

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<p>Returns the prefix string for micro-units; namely the default thing for long-form format ("micro") but the non-default "u" for the short-form. </p>
<p >Hence microseconds are either "microsecond[s]" or "us."</p>
<h3>Rationale</h3>
<p >This is <code>public</code> only so as to work as a <code>virtual</code> facet interface element invoked by STL <code>ostream</code> machinery upon imbuing <code>*this</code> onto a <code>locale</code>. Since <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html" title="Internally used class that enables some of the activities of beautify_chrono_ostream() API.">Duration_units_beautified</a> is not exposed as a <a class="el" href="namespaceflow_1_1util.html" title="Flow module containing miscellaneous general-use facilities that don&#39;t fit into any other Flow module...">flow::util</a> public API, leaving this method <code>public</code> (to our internal code in this .cpp file only) is acceptable.</p>
<dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">style</td><td>Either <code>name_format</code> or <code>symbol_format</code> (the latter being the short-form choice). </td></tr>
    <tr><td class="paramname">period_tag</td><td>Tag indicating this method is for the micro prefix. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>The prefix string. </dd></dl>

<p class="definition">Definition at line <a class="el" href="util_8cpp_source.html#l00129">129</a> of file <a class="el" href="util_8cpp_source.html">util.cpp</a>.</p>

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<h2 class="groupheader">Member Data Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aabd0fb641c4234515bac298d7a11d7c3">&#9670;&nbsp;</a></span>s_beautified_locale_init_flag</h2>

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<p>Helper to initialize <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#a5c21a947d16a428314a077528876bde3" title="Pointer returned by beautified_locale(), pointing to an object allocated exactly once; or null if tha...">s_beautified_locale_or_null</a> at most once. </p>

<p class="definition">Definition at line <a class="el" href="util_8cpp_source.html#l00098">98</a> of file <a class="el" href="util_8cpp_source.html">util.cpp</a>.</p>

<p class="reference">Referenced by <a class="el" href="util_8cpp_source.html#l00116">beautified_locale()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a5c21a947d16a428314a077528876bde3">&#9670;&nbsp;</a></span>s_beautified_locale_or_null</h2>

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          <td class="memname">std::locale const  * flow::util::Duration_units_beautified::s_beautified_locale_or_null</td>
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<p>Pointer returned by <a class="el" href="classflow_1_1util_1_1Duration__units__beautified.html#aa689f853f75e06263d6875ae5824a4c6" title="Returns a reference to a locale that – if imbued onto an ostream – equals std::locale::classic except...">beautified_locale()</a>, pointing to an object allocated exactly once; or null if that has not yet been called. </p>
<p >The allocated object lives until the process exits. </p>

<p class="definition">Definition at line <a class="el" href="util_8cpp_source.html#l00095">95</a> of file <a class="el" href="util_8cpp_source.html">util.cpp</a>.</p>

<p class="reference">Referenced by <a class="el" href="util_8cpp_source.html#l00116">beautified_locale()</a>.</p>

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<hr/>The documentation for this class was generated from the following file:<ul>
<li>util/<a class="el" href="util_8cpp_source.html">util.cpp</a></li>
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